$midTop:50%;
$midLeft:50%;

.wrapper{
    height: 200px;
    width: 200px;
    position: relative;
    left: $midLeft;
    top: $midTop;
    margin-top: -100px;
    margin-left: -100px;
}
.wrapper div{
    position: absolute;
    left: $midLeft;
    top: $midTop;
    margin-top: -16px;
    margin-left: -18px;
}
